Hi,

I'm 30F with no other underlying conditions. I presented to my GP in 2023 with fatigue and low mood as my main symptoms. Blood results showed 15ug/L for ferritin, which he diagnosed as deficiency. I've been taking ferrous sulphate ever since, having two other blood tests within 6 and 12 months, first one showed it increasing to 26, the last one was in March 2025 showing further increase to 46ug/L. Great, it's working! My B12 levels were also "borderline low" at 252ng/L. 

However when I moved GPs I was due for another blood test to check on levels. Long story short, I had a phone appointment in November 2025 with another GP (not my own practice but my own practice did book it for me), who said I shouldn't have been left with supplements with no follow up at all. She asked me to stop supplements for 3 months and have my levels rechecked, to see if can maintain my own levels.

Anyway 3 months later (now)I've had my bloods done again and my levels have fallen back down to 34ug/l and my B12 has dropped a tiny bit too to 242ng/L. Everything's within "normal" range, however I have noticed fatigue and all my other pre supplement symptoms creeping back in.

I'm not sure what to do? I know these aren't terrible results so I'm not worried. But I do feel like crap again. Do these results mean I can't maintain levels very well without supplements?Would I benefit from another appointment to discuss my results and suggest re supplementing again? I don't have heavy periods and I eat a normal balanced diet. I'm finding it all very confusing because different doctors keep telling me different things over the years. 

Sorry, another boring post about iron levels